Platinum Arts Sandbox - Free 3D Game Maker Forum

I know I can speed up the grass movement by typing >/gamespeed (N) where N>100, but how do I make it bend more, like in the forest map Hirato made? I found a topic discussing this earlier in my search, but it wasn't resolved and the last post was in September of 2010.

I'm not sure how to do this, but you should probably go to Hirato himself.